Modified polyolefin fibers and a non-woven fabric using the same

Abstract

Modified polyolefin fibers capable of easily producing a non-woven fabric having a high strength and a superior feeling, and provided with a broad range of processing temperature and further a low temperature adhesiveness and suitable to heating roll processing, and a non-woven fabric using the same are provided, which fibers are obtained by adhering 0.1 to 1.0% by weight of an oiling agent composed mainly of a dibasic acid ester and/or a fatty acid ester, to polyolefin fibers having an index of birefringence of 0.054 or less, and which non-woven fabric has a strength of 0.85 or higher (Kg/5 cm) at 134° C. and a processing temperature width of 132° to 138° C.

What we claim is: 
     
       1. Modified polyolefin fibers having 0.1 to 1.0% by weight of an oiling agent consisting essentially of a dibasic acid ester of at least one member selected from the group of acids consisting of adipic acid, sebacic acid, phthalic acid, terephthalic acid, succinic and maleic acid with an aliphatic alcohol, or an aliphatic acid ester of at least one member of acids selected from the group consisting of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid with an alkyl monoalcohol or said dibasic acid ester and said aliphatic acid ester, adhered onto polyolefin fibers having an index of birefringence of 0.054 or less. 
     
     
       2. Modified polyolefin fibers according to claim 1, wherein the polyolefin fibers are polypropylene fibers. 
     
     
       3. Modified polyolefin fibers according to claim 1, wherein the polyolefin fibers are those of an olefin bipolymer or terpolymer, composed of propylene as main component and ethylene or butene-1. 
     
     
       4. Modified polyolefin fibers according to claim 1, wherein said dibasic acid ester is of at least one member selected from the group consisting of dioctyl adipate and dibutoxyethyl sebacate. 
     
     
       5. Modified polyolefin fibers according to claim 1, wherein said aliphatic acid ester is at least one acid selected from the group consisting of methyl caprate, octyl laurate and methyl palmitate. 
     
     
       6. A modified polyolefin non-woven fabric characterized by using modified polyolefin fibers set forth in claim 1. 
     
     
       7. Modified polyolefin fibers according to claim 1 wherein said dibasic acid ester is at least one member selected from the group consisting of dioctyl adipate, dibutoxyethyl sebacate and dioctyl phthalate. 
     
     
       8. Modified polyolefin fibers according to claim 1 wherein said aliphatic acid ester is at least one member selected from the group consisting of methyl caprate, octyl laurate and methyl palmitate. 
     
     
       9. A modified polyolefin fiber having an index of birefringence of 0.054 or less and having 0.1 to 1.0% by weight of an oiling agent adhered thereto, wherein the oiling agent consisting of an ester selected from the group of esters consisting of adipic acid, sebacic acid, phthalic acid, terephthalic acid, succinic and maleic acid with an aliphatic alcohol. 
     
     
       10. A modified polyolefin fiber having an index of birefringence of 0.054 or less and having 0.1 to 1.0% by weight of an oiling agent adhered thereto, wherein the oiling agent consisting of an ester selected from the group of esters consisting of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid with an alkyl monoalcohol.